%0 Journal Article %A D. I. Panyushev %T Orbits of maximal dimension of~solvable subgroups of reductive linear groups, and reduction for $U$-invariants %J Sbornik. Mathematics %D 1988 %P 365-375 %V 60 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1988_60_2_a6/ %G en %F SM_1988_60_2_a6